The give strength!

I can fully join the other reviews. The fins are pleasant and fit the foot, you get a good feeling and water especially POWER, POWER, POWER - assuming diligent training. After the first intense workouts I've always done totally and had to thank a little soreness the next day.
The lifeguards have nothing to complain about because the fins are fairly inconspicuous. Last but not least: bring fun while swimming, and so it should be!